Protector for underground pipes



. (No Model.)

W. 8v J. M'. ROWBOTTOM. PROTECTOR PoR UNDERGROUND PIPRS. No. 310,727. Patented Jan. .13, 1885.

'IllllIIIIIIIIIIIIIIIIIIIIIIIIII l IIIIIIIIIlllllllllllllllllllllll.

dal

l A/l' l/ 1 HILLIERSEL E1 1111-5 W1/c. am M f m UNITED STATES artnr rtree,

WILLIAM ROWBOTTOM AND JOHN M. ROWBO'ITOM, OF ALLEGHENY CITY, PENNSYLVANIA.

PROTECTOR FOR UNDERGROUND PIPES.

SPECIFICATION forming part of Letters Patent No. 310,727, dated January 13, 1885.

Y Application filed June 2:2, 18%. (No model.)

To all whom, it may concern.-

Be it known that we, WILLIAM RoWBoT- TOM and JOHN M. RoWBoTToM, of Allegheny City, in the county of Allegheny and State of 5 Pennsylvania, have invented a new and useful Improvement in Protectors for Underground Pipes; and we do hereby declare the following to be a full, clear, and exact description thereof.

1o Naked gas and water pipes which are buried in or under cinder-piles,or made ground co1nposed partially ofcinders,are exposed to rapid destruction by corrosion, resulting from an acidulous solution which sinks upon and at- 15 tacks them from the cinders wherever water from rain or other source passes down through the cinders. This condition also exists to a greater orless extent with some different kinds of earth.

2o The object of our invention is to protect such pipes and similar metallic articles from such corrosion; and it consists in providing them with an impervious covering which is not itself affected by the acids.

2 5 To enable others skilled in the art to make and use our invention, we will now describe it by reference to the accompanying drawings, in which- Figure l is a longitudinal section, and Fig.

3o 2 a cross-section on the line m x of Fig. l.

We construct a wooden box,a,and before putting the top side in place We iill the box with a composition of cement and sand in a plastic stat-e, the proportions of which are preferably 35 cement one-half and sand one-half. The pipe b is placed centrally in the box and the cement c filled in around it until the box is full, and then the cover c' is attached. rlhe composition c hardens around the pipe and becomes 4o sufficiently strong to support the same when the box a rots away around it, which it will do very rapidly when buried in the earth. The covering c thus provided for the pipe is impervious to moisture, and so prevents the acid solution from coming in contact with the surface of the pipe, and thereby protects the latter from its corrosive action. The box a may be made long enough to contain the entire length of pipe, and after having been placed in the trench the pipe and composition covering may be applied,as described.

We do not limit ourselves to the use of our improvement with any particular kind or form of pipe. It is, however, more useful with lead pipe, which corrodes more rapidly than iron pipe. We also claim it in connection with metallic articles of analogous character.

It has been our experience that ordinary lead pipe will be destroyed when placed belowa cinder-pile in as short a period as ten months. With the use of our improvement such pipe is substantiallyindestructible, being fully and completely protected, not only from the corrosive action before mentioned, but also from injury by other causes.

ln applying the covering we prefer to make it of a diameter of four inches for half-inch pipe, and five inches for three-fourths inch to ,one-inch pipe.

Vhat we claim as our inventiomand desire to secure by Letters Patent, :is-

As an improvement in protecting metallic water and similar pipes laid under cinderbanks and similar places from the corrosive action of the acidulous drainage therefrom, Ythe combination of such a pipe with a thick impervious covering composed of cement and sand, substantially as and for thepurposes described.

In testimony whereof we have hereunto set WILLIAM ROWBOTTOM. JOHN M. ROWBOTTOM. Vitnesses:

W. B. CORWIN, T. B. KERK.

our hands this 20th day of June, A. D. 1883. 

